Each piston of an engine makes a sharp sound every other revolution of the engine. How fast is a race car going if its eight–cylinder engine emits a sound of frequency 880 Hz, given that the engine makes 2400 revolutions per kilometer?

Final Answer

a.340 km/h

b.1.1×104 rev/min

is the correct answer

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )